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Although Pengcheng had already established a fixed waterway with Kyoto, for some reason their currency system hadn't been synchronized with the Imperial Court. Instead, they were using paper money issued by Pengcheng as the credit currency.
Of course, there were also hard currencies such as gold and silver. Due to breakthroughs in materials, gold and silver had found other uses. Before the Imperial Court made up its mind to unify the currency, gold and silver had once again been given the property of trade equivalency.
However, because they had become consumables, their use by ordinary people was affected, so any larger-scale camps would issue their own credit currency.
The camp was not small, so in Zachary's view, there must indeed be a 'trade currency' unique to the camp.
Gold and silver were not unusable, but using them in common shops, one glance at your payment in gold and silver would reveal you as an outsider.
